Brooklyn federal prosecutors arrested a 13-year police detective on civil rights charges that he allegedly coerced three women to have sex with him in exchange for leniency.

Oscar Sandino, 37, who worked in the Queens Narcotics Bureau South from June 2006 to March 2008 is accused of forcing a woman charged with drug dealing to perform oral sex on him in the precinct bathroom in exchange for letting her go.

Sandino also threatened to have the woman’s children taken away from her if she did not perform the sex act.

On Feb. 20, 2008, cops stormed the woman’s apartment in Jackson Heights where she lived with her children and boyfriend.

New York Police Department Officer Oscar Sandino is led in handcuffs from FBI headquarters today.

Sandino took the woman in the back bedroom and forced her to take her clothes off, according to a lawsuit that was filed against him in Manhattan Federal Court last year.

The married father of two then allegedly took the mother of three on a car ride after the raid, at which time he allegedly threatened her, saying, “You know you are going to lose your kids,” and asked her what she was willing to do for them.

“What do you mean – anything?” she answered.

“How did your children come into the world? . . . You had to be bedded,” Sandino allegedly responded in Spanish.

He took her back to the police station and while she was in the interrogation room he demanded “What’s your answer?” He allegedly took the plaintiff into the precinct bathroom where offered to “rip up the papers” from the Administration for Child Services if she would have sex with him.

Sandino ordered the woman to pull her pants down.

“Wow, you have an earring down there,” he said and groped the woman.

He then forced her to perform oral sex right there in the precinct bathroom.

“You must do this to all the girls,” the woman told him.

According to federal prosecutors, she was right.

Sandino was also accused of forcing a female drug dealer to have sex with him under similar circumstances in 2006 and inappropriately touching a female court officer who had been arrested in 2009.

If this has happened to you, please contact your local FBI field office and file a complaint.